Our own way of procedure will have to be such that Goethe's method, and its fruitfulness for the general advance of science, come as clearly as possible into view.³ Botanical details will be referred to only as far as seems necessary for this purpose.

In this succession, Goethe recognized a certain rhythm of expansion and contraction, and he found that the plant passes through it three times during any one cycle of its life. In the foliage the plant expands, in the calyx it contracts; it expands again in the flower and contracts in the pistil and stamens; finally, it expands in the fruit and contracts in the seed.

Having once advanced in his investigations from metamorphosis in the parts of the single plant to metamorphosis among different representatives of single plant species, Goethe had to take only one further, entirely decisive, step in order to recognize how every member of the plant kingdom is the manifestation of a single formative principle common to them all. He was thus faced with the momentous task of preparing his spirit to think an idea from which the plant world in its entire variety could be derived.

Biological science of our day takes it for granted that the process uniting pollen with seed in the plant is an act of fertilization analogous to that which occurs among the higher organisms of nature. Now it is not to be gainsaid that to external observation this comparison seems obvious, and that it is therefore only natural to speak of the pollen as the male, and of the ovule as the female, element, and of their union as entirely parallel to that between the sexes in the higher kingdoms of nature.

In the case of the plant this discontinuity is achieved by the breaking asunder of the male and female growth-principles. When they have reunited, the type begins to abandon either the entire old plant or at least part of it, according to whether the species is an annual or a perennial one, in order to concentrate on the tiny seed, setting, as it were, its living seal on it.

Wolff's case was to Goethe a symptom of the danger which he saw arising for science from the rapidly increasing use of the microscope (and similarly the telescope), if thinking was not developed correspondingly but left at the mercy of these instruments. His concern over the state of affairs speaks from his utterance: 'Microscopes and telescopes, in actual fact, confuse man's innate clarity of mind.'

'For external objects as phenomena an adequate ground related to purposes cannot be met with; this, although it lies in nature, must be sought only in the supersensible substrata of nature, from all possible insight into which we are cut off. Our understanding has then this peculiarity as concerns the judgment, that in cognitive understanding the particular is not determined by the universal and cannot therefore be derived from it.'

The data for observation, from which in Goethe's own fashion we shall start, have been selected as best for our purpose, quite independently of the data used by Goethe himself. Our choice was determined by the material available when these pages were being written. The reader is free to supplement our studies by his own observation of other plants.

The deeper meaning of this threefold rhythm will become clear when we consider it against the background of what we observed in the metamorphosis of the leaf. Take the mallow leaf; its metamorphosis shows a step-wise progression from coarser to finer forms, whereby the characteristic plan of the leaf comes more and more into view, so that in the topmost leaf it reaches a certain stage of perfection. Now we observe that in the calyx this stage is not improved on, but that the plant recurs to a much simpler formation.

Goethe did not take such a step easily, for it was one of his scientific principles never to think out an idea prematurely. He was well aware that he who aspires to recognize and to express in idea the spirit which reveals itself through the phenomena of the sense-world must develop the art of waiting - of waiting, however, in a way intensely active, whereby one looks again and yet again, until what one looks at begins to speak and the day at last dawns when, through tireless 're-creation of an ever-creating nature', one has grown ripe to express her secrets openly. Goethe was a master in this art of active waiting.